Business ProfileforFrontier Ford

So I went and bought a 2016 **** focus RS from frontier Ford ********* ********** they gave me $20,967 for a trade-in thats what I owed for my original car when I went in the **** focus RS was $30,000. They charged me an additional $$7744 on top of the 30 that it was advertised for. I called and asked why today when I realized after nine months when I try to refinance they said because I had negative equity and I said but you gave me what my car was worth $20,967 is what I owe on it and they said yeah but to offset it we increased the price of the vehicle well I was never told or discussed about this. I thought I was paying $30,000 for this vehicle and instead I was paying $37,744 for this vehicle. If I wouldve known I wouldve told them never mind because $7744 is a big difference. They told me afterwards that is not their problem. I signed documentation and I can just f*** off. Im very upset about it. I contacted **** corporate directly already. And theyre looking into it its not a good way to do business and I know Im not the first person whos had issues with them when I first bought the car. It had a blown motor in it and they knew about it because the sales guy owe they didnt fix it before you picked it up, so I spent four months without a car. It was covered by warranty, but still overall experience is horrible and the ripping people off.